<template>
   <div>
      <!-- 面包屑导航区 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/Params' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>商品管理</el-breadcrumb-item>
         <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
      <!--卡片视图区-->
      <el-card>
         <el-alert title="注意：只允许第三级分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>
         <!--选择商品分类区域-->
         <el-row class="cat_opt">
            <el-col>
               <span>选择商品分类：</span>
               <!--选择商品分类的级联选择框--> <!--级联选择器-->
               <!--options 数据源 - -props 用来制定数据配置对象 -->
               <el-cascader
                  expandTrigger='hover'
                  v-model="selectedCateKeys"
                  :options="catelist"
                  :props="cateProps "
                  @change="handleChange">

               </el-cascader>
            </el-col>
         </el-row>
         <!--tab页签区域-->
         <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!--添加动态参数-->
            <el-tab-pane label="动态参数" name="many">
               <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible= true">添加参数
               </el-button>
               <!-- 动态参数表格-->
               <el-table :data="manyTableData" border stripe>
                  <!--展开列-->
                  <el-table-column type="expand">
                     <!--循环渲染tag标签-->
                     <template slot-scope="scope">
                        <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable
                                @close="handleClose(i,scope.row)">{{ item }}
                        </el-tag>
                        <!--输入的文本框-->
                        <el-input
                           class="input-new-tag"
                           v-if="scope.row.inputVisible"
                           v-model="scope.row.inputValue"
                           ref="saveTagInput"
                           size="small"
                           @keyup.enter.native="handleInputConfirm(scope.row)"
                           @blur="handleInputConfirm( scope.row)">
                        </el-input>
                        <!--添加的button-->
                        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                        </el-button>
                     </template>
                  </el-table-column>
                  <!--索引列-->
                  <el-table-column type="index"></el-table-column>
                  <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                  <el-table-column label="操作名称">
                     <template slot-scope="scope">
                        <el-button type="primary" size="mini" icon="el-icon-edit"
                                   @click="showEditDialog(scope.row.attr_id)">编辑
                        </el-button>
                        <el-button type="danger" size="mini" icon="el-icon-delete"
                                   @click="removeParams(scope.row.attr_id)">删除
                        </el-button>
                     </template>
                  </el-table-column>
               </el-table>
            </el-tab-pane>
            <!-- 添加静态参数-->
            <el-tab-pane label="静态参数" name="only">
               <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
               </el-button>
               <!-- 静态参数表格-->
               <el-table :data="onlyTableData" border stripe>
                  <!--展开列-->
                  <el-table-column type="expand">
                     <!--循环渲染tag标签-->
                     <template slot-scope="scope">
                        <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable
                                @close="handleClose(i,scope.row)">{{ item }}
                        </el-tag>
                        <!--输入的文本框-->
                        <el-input
                           class="input-new-tag"
                           v-if="scope.row.inputVisible"
                           v-model="scope.row.inputValue"
                           ref="saveTagInput"
                           size="small"
                           @keyup.enter.native="handleInputConfirm(scope.row)"
                           @blur="handleInputConfirm( scope.row)">
                        </el-input>
                        <!--添加的button-->
                        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                        </el-button>
                     </template>
                  </el-table-column>
                  <!--索引列-->
                  <el-table-column type="index"></el-table-column>
                  <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                  <el-table-column label="操作名称">
                     <template slot-scope="scope">
                        <el-button type="primary" size="mini" icon="el-icon-edit"
                                   @click="showEditDialog(scope.row.attr_id)">编辑
                        </el-button>
                        <el-button type="danger" size="mini" icon="el-icon-delete"
                                   @click="removeParams(scope.row.attr_id)">删除
                        </el-button>
                     </template>
                  </el-table-column>
               </el-table>
            </el-tab-pane>
         </el-tabs>
      </el-card>
      <!--   添加参数的对话框-->
      <el-dialog
         :title="'添加' + titleText"
         :visible.sync="addDialogVisible"
         width="50%" @close="addDialogClosed">
         <!--form表单-->
         <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
               <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
         </el-form>
         <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
      </el-dialog>
      <!--点击修改编辑-->
      <el-dialog
         :title="'修改' + titleText"
         :visible.sync="editDialogVisible"
         width="50%" @close="editDialogClosed">
         <!--form表单-->
         <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
               <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
         </el-form>
         <span slot="footer" class="dialog-footer">
         <el-button @click="editDialogVisible = false">取 消</el-button>
         <el-button type="primary" @click="editParams">确 定</el-button>
       </span>
      </el-dialog>
   </div>
</template>

<script>
export default {
   data() {
      return {
         catelist: [], //商品列表所有数据
         // 级联选择框的配置对象
         cateProps: {
            value: 'cat_id',
            label: 'cat_name',
            children: 'children'
         },
         // 级联选择框双向绑定到的数组
         selectedCateKeys: [],
         activeName: 'many',  //页签双向绑定名称
         manyTableData: [],  //动态数组
         onlyTableData: [],  //静态参数
         addDialogVisible: false,  //添加参数对话框
         //添加参数的绑定事件对象
         addForm: {
            attr_name: ''
         },
         //添加对象的表单验证对象
         addFormRules: {
            attr_name: [
               {required: true, message: '请输入参数名称', trigger: 'blur'}
            ]
         },
         editDialogVisible: false,   // 控制修改对话框的显示隐藏
         editForm: {},  //修改的表单数据对象-双向绑定
         // 修改编辑框验证规则对象
         editFormRules: {
            attr_name: [
               {required: true, message: '请输入参数名称', trigger: 'blur'}
            ]
         },
         // // 控制文本框和添加按钮的切换
         // inputVisible:false,
         // // 文本框输入的内容-双向绑定
         // inputValue:'',
      }
   },
   created() {
      this.getCateList()  //获取所有商品分类的列表
   },
   methods: {
      async getCateList() {
         const {data: res} = await this.$http.get('categories')
         if (res.meta.status !== 200) {
            return this.$message.error('获取商品分类失败！')
         }
         this.catelist = res.data
         // console.log(this.catelist)
      },
      // 级联选择框选中项变化出发函数
      handleChange() {
         this.getParamsData()
      },
      // 监听页(签静态动态参数的变)点击处理化函数
      handleTabClick() {
         this.getParamsData()
      },
      // 抽离出来的方法--获取列表数据
      async getParamsData() {
         // 双向绑定的返回数组必须等于三，小于三说明没选中三级商品类
         if (this.selectedCateKeys.length !== 3) {
            this.selectedCateKeys = []
            this.manyTableData = []
            this.onlyTableData = []
            return
         }
         // 那么证明选中的是三级商品分类
         // 根据所选中的id个动态静态面板获取数据
         const {data: res} = await this.$http.get(
            `categories/${this.cateId}/attributes`,
            {params: {sel: this.activeName}}
         )
         // console.log(this.selectedCateKeys[2]);
         // console.log(res.meta.status);
         if (res.meta.status !== 200) {
            return this.$message.error('获取参数列表失败！')
         }
         // 通过forEch()循环存储attr_vals展开项
         res.data.forEach(item => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
            // 控制文本框的隐藏或显示
            item.inputVisible = false
            item.inputValue = ''
         })
         console.log(res.data)
         // 判断：activeName是静态还是动态，然后把获取的数据赋值给新的静态和动态的数组
         if (this.activeName === 'many') {
            this.manyTableData = res.data
         } else {
            this.onlyTableData = res.data
         }
      },
      // 监听取消添加参数的事件
      addDialogClosed() {
         this.$refs.addFormRef.resetFields()
      },
      // 确定添加按钮的事件
      addParams() {
         // 发起请求前 需做个输入规则的验证
         this.$refs.addFormRef.validate(async valid => {
            if (!valid) return
            const {data: res} = await this.$http.post(
               `categories/${this.cateId}/attributes`,
               {
                  attr_name: this.addForm.attr_name,
                  attr_sel: this.activeName
               }
            )
            if (res.meta.status !== 201) {
               return this.$message.error('添加参数失败！')
            }
            this.$message.success('添加参数成功！')
            this.addDialogVisible = false
            this.getParamsData()
         })

      },
      // 点击按钮修改的对话框
      async showEditDialog(attr_id) {
         // 查询当前参数的信息
         const {data: res} = await this.$http.get(
            `categories/${this.cateId}/attributes/${attr_id}`, {
               params: {attr_sel: this.activeName}
            }
         )
         if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败！')
         }
         this.editForm = res.data
         this.editDialogVisible = true
      },
      // 清空重置修改的表单
      editDialogClosed() {
         this.$refs.editFormRef.resetFields()
      },
      // 点击按钮修改信息确定按钮
      editParams() {
         this.$refs.editFormRef.validate(async valid => {
            if (!valid) return
            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                  attr_name: this.editForm.attr_name,
                  attr_sel: this.activeName
               }
            )
            if (res.meta.status !== 200) {
               return this.$message.error('修改参数失败！')
            }
            this.$message.success('修改参数成功！')
            this.getParamsData()
            this.editDialogVisible = false
         })

      },
      // 根据id删除对应的参数,点击删除弹出确认对话框。confirm返回promise async await优化
      async removeParams(attr_id) {
         const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
         }).catch(err => err)
         // 用户取消了删除的操作
         if (confirmResult !== 'confirm') {
            return this.$message.info('已取消删除！')
         }
         // 删除逻辑
         const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
         if (res.meta.status !== 200) {
            return this.$message.error('删除失败!')
         }
         this.$message.success('删除成功！')
         this.getParamsData()

      },
      // 文本框失去焦点或摁下了enter都会出发
      async handleInputConfirm(row) {
         if (row.inputValue.trim().length === 0) {
            row.inputValue = ''
            row.inputVisible = false
            return
         } //没有return说明用户输入的内容需要后续处理
         row.attr_vals.push(row.inputValue.trim())
         row.inputValue = ''
         row.inputVisible = false
         await this.saveAttrVvals(row)  //这个方法attr_vals的添加请求操作抽离出来了
      },
      // 把attr_vals的添加操作抽离出来，添加操作请求
      async saveAttrVvals(row) {
         // 需要发起请求报错这次操作或发起请求完成后台添加
         const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')  //本地是数组形式，后台要字符串，所有空格来似拼接
         })
         if (res.meta.status !== 200) {
            return this.$message.error('修改参数项失败！')
         }
         this.$message.success('修改参数成功！')
      },
      // 点击按钮展示文本输入框
      showInput(row) {
         row.inputVisible = true //点击了就显示文本输入框
         // 让文本框自动获取焦点
         // $nextTick函数的作用：就是页面上的元素被重新渲染之后才会制定回调函数中的代码--获取到的最新
         this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
         });
      },
      // 删除对呀的参数和对象
      handleClose(i, row) {
         row.attr_vals.splice(i, 1)
         this.saveAttrVvals(row)
      }

   },
   computed: {
      // 添加参数和属性按钮的禁用启用状态的计算属性
      isBtnDisabled() {
         if (this.selectedCateKeys.length !== 3) {
            return true
         }
         return false
      },
      // 当前选中的三级分类的id
      cateId() {
         if (this.selectedCateKeys.length === 3) {
            return this.selectedCateKeys[2]
         }
         return null
      },
      // 动态计算标题的文本-动态判断添加参数里面的按钮名称，动态静态对话框里通用一个添加按钮，自动同步显示名称
      titleText() {
         if (this.activeName === 'many') {
            return '动态参数'
         }
         return '静态参数'
      }
   },


}
</script>

<style lang="less" scoped>
.cat_opt {
   margin: 15px 0;
}

.el-tag {
   margin: 10px;
}

.input-new-tag {
   width: 120px;
}
</style>
